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        <h1 class="title">Hi MyBatis ~</h1>
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                <time datetime="2019-05-09T21:02:06.000Z" itemprop="datePublished" class="page-time">
  2019-05-09
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            <h4>TOC</h4>
            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-初识MyBatis"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : 初识MyBatis</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#MyBatis-工作原理"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">MyBatis 工作原理</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#MyBatis-入门程序"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">MyBatis 入门程序</span></a></li></ol></li></ol>
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<article id="post-Hi-MyBatis"
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        <h1 class="post-card-title">Hi MyBatis ~</h1>
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            <time class="post-time" title="2019-05-09 21:02:06" datetime="2019-05-09T21:02:06.000Z"  itemprop="datePublished">2019-05-09</time>

            


            

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            <h2 id="学习笔记-初识MyBatis"><a href="#学习笔记-初识MyBatis" class="headerlink" title="学习笔记 : 初识MyBatis"></a>学习笔记 : 初识MyBatis</h2><p><em>简介 : <code>MyBatis</code>的前身是<code>iBATIS</code>,是Clinton Begin在2001年发起的一个开源项目,最初侧重于密码软件的开发,后来发展成为一款基于Java的持久层框架.2004年,Clinton将iBATIS的名字和源码捐赠给了Apache软件基金会.2010年,核心开发团队决定离开Apache软件基金会,并且将iBATIS该名为MyBatis.</em></p>
<h3 id="MyBatis-工作原理"><a href="#MyBatis-工作原理" class="headerlink" title="MyBatis 工作原理"></a>MyBatis 工作原理</h3><p><em>MyBatis框架执行流程图如下所示 :</em></p>
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<p><em>从MyBatis框架执行流程图中可得知,MyBatis框架在操作数据库时,大体经过了8个步骤.下面对每一步进行详解哟 ~</em></p>
<ol>
<li><p>读取MyBatis配置文件<code>mybatis-config.xml</code>.其作为MyBatis的全局配置文件,配置了MyBatis的运行环境等信息,其中主要内容是获取数据库连接.</p>
</li>
<li><p>加载映射配置文件<code>Mapper.xml</code>.既SQL映射文件,该文件配置了操作数据库的SQL语句,需要在<code>mybatis-config.xml</code>中加载才能执行.<code>mybatis-config.xml</code>可以加载多个配置文件,每个配置文件对应数据库中的一张表.</p>
</li>
<li><p>构建会话工厂.通过MyBatis的环境等配置信息构建会话工厂<code>SqlSessionFactory</code>.</p>
</li>
<li><p>创建<code>SqlSession</code>对象.由会话工厂创建SqlSession对象,该对象中包含了执行SQL的所有方法.</p>
</li>
<li><p>MyBatis底层定义了一个<code>Executor</code>接口来操作数据库,它会根据<code>SqlSession</code>传递的参数动态地生成需要执行的SQL语句,同时负责查询缓存的维护.</p>
</li>
<li><p>在<code>Executor</code>接口的执行方法中,包含一个<code>MappedStatement</code>类型的参数,该参数是对映射信息的封装,用于存储要映射的SQL语句的id,参数等.. <code>Mapper.xml</code>文件中一个SQL对应一个MappedStatement对象,SQL的id既是MappedStatement的id.</p>
</li>
<li><p>输入参数映射,其过程类似于JDBC编程中对preparedStatement对象设置参数的过程.</p>
</li>
<li><p>输出参数映射,其过程类似于JDBC编程中对结果的解析处理过程.</p>
</li>
</ol>
<h3 id="MyBatis-入门程序"><a href="#MyBatis-入门程序" class="headerlink" title="MyBatis 入门程序"></a>MyBatis 入门程序</h3><ol>
<li><p><em>User.java : 一个简单Java bean</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mybatis.bean;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: User</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 封装用户信息</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 9, 2019 5:07:23 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> Integer id;</span><br><span class="line">	<span class="keyword">private</span> String name;</span><br><span class="line">	<span class="keyword">private</span> String gender;</span><br><span class="line">	<span class="keyword">private</span> String email;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Integer <span class="title">getId</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> id;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(Integer id)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.id = id;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getGender</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> gender;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGender</span><span class="params">(String gender)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.gender = gender;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getEmail</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setEmail</span><span class="params">(String email)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.email = email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="string">"User [id="</span> + id + <span class="string">", name="</span> + name + <span class="string">", gender="</span> + gender + <span class="string">", email="</span> + email + <span class="string">"]"</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>db.properties : 数据库配置信息文件.</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">#database configuration information</span><br><span class="line">jdbc.driver=com.mysql.cj.jdbc.Driver</span><br><span class="line">jdbc.url=jdbc:mysql://LOCALHOST/MyBatis?useSSL=false&amp;serverTimezone=UTC&amp;allowPublicKeyRetrieval=true</span><br><span class="line">jdbc.username=root</span><br><span class="line">jdbc.password=GoodTime</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>mybatis-config.xml : MyBatis核心配置文件</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8" ?&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">configuration</span></span></span><br><span class="line"><span class="meta"> <span class="meta-keyword">PUBLIC</span> <span class="meta-string">"-//mybatis.org//DTD Config 3.0//EN"</span></span></span><br><span class="line"><span class="meta"> <span class="meta-string">"http://mybatis.org/dtd/mybatis-3-config.dtd"</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">configuration</span>&gt;</span></span><br><span class="line">	<span class="comment">&lt;!-- 读取数据库配置文件 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">properties</span> <span class="attr">resource</span>=<span class="string">"db.properties"</span> /&gt;</span></span><br><span class="line">	<span class="comment">&lt;!-- 配置环境-默认环境id为MySQL --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">environments</span> <span class="attr">default</span>=<span class="string">"MySQL"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"MySQL"</span>&gt;</span></span><br><span class="line">			<span class="comment">&lt;!-- 使用JDBC事务管理 --&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span> /&gt;</span></span><br><span class="line">			<span class="comment">&lt;!-- 数据库连接池 --&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"$&#123;jdbc.driver&#125;"</span> /&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"$&#123;jdbc.url&#125;"</span> /&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"$&#123;jdbc.username&#125;"</span> /&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"$&#123;jdbc.password&#125;"</span> /&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">dataSource</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">environment</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">environments</span>&gt;</span></span><br><span class="line">	<span class="comment">&lt;!-- 将sql映射文件注册到全局配置文件中 --&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">mapper</span> <span class="attr">resource</span>=<span class="string">"UserMapper.xml"</span> /&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">configuration</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>UserTest.java : 测试类</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.mybatis.bean.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.io.InputStream;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.io.Resources;</span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.session.SqlSession;</span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.session.SqlSessionFactory;</span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.session.SqlSessionFactoryBuilder;</span><br><span class="line"><span class="keyword">import</span> org.junit.jupiter.api.Test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> pers.huangyuhui.mybatis.bean.User;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: UserTest</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: Test Mybatis</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 9, 2019 5:26:52 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserTest</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	InputStream inputStream;</span><br><span class="line">	SqlSessionFactory sqlSessionFactory;</span><br><span class="line">	SqlSession sqlSession;</span><br><span class="line"></span><br><span class="line">	<span class="meta">@Test</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">try</span> &#123;</span><br><span class="line">			<span class="comment">// 读取配置文件</span></span><br><span class="line">			inputStream = Resources.getResourceAsStream(<span class="string">"mybatis-config.xml"</span>);</span><br><span class="line">			<span class="comment">// 根据配置文件构建会话工厂对象</span></span><br><span class="line">			SqlSessionFactory sqlSessionFactory = <span class="keyword">new</span> SqlSessionFactoryBuilder().build(inputStream);</span><br><span class="line">			<span class="comment">// 通过SqlSessionFactory创建SqlSession</span></span><br><span class="line">			sqlSession = sqlSessionFactory.openSession();</span><br><span class="line">			<span class="comment">// 执行映射文件中定义的SQL并返回映射结果</span></span><br><span class="line">			User user = sqlSession.selectOne(<span class="string">"Namespace.UserInfoMapper.SelectUserInfoByID"</span>, <span class="number">1</span>);</span><br><span class="line"></span><br><span class="line">			System.out.println(user);</span><br><span class="line"></span><br><span class="line">		&#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">			e.printStackTrace();</span><br><span class="line">		&#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">			sqlSession.close();</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>log4j.properties : 日志文件(便于查看MyBatis操作数据库的过程).</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">#Global configuration</span><br><span class="line">log4j.rootLogger=DEBUG,stdout</span><br><span class="line">#Log configuration</span><br><span class="line">log4j.logger.pers.huangyuhui.mybatis.bean.test=TRACE</span><br><span class="line">#Console configuration</span><br><span class="line">log4j.appender.stdout=org.apache.log4j.ConsoleAppender</span><br><span class="line">log4j.appender.stdout.layout=org.apache.log4j.PatternLayout</span><br><span class="line">log4j.appender.stdout.layout.layout.ConversionPattern=%5p [%t] - %m%n</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行结果如下所示</em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">Logging initialized using &apos;class org.apache.ibatis.logging.log4j.Log4jImpl&apos; adapter.</span><br><span class="line">PooledDataSource forcefully closed/removed all connections.</span><br><span class="line">PooledDataSource forcefully closed/removed all connections.</span><br><span class="line">PooledDataSource forcefully closed/removed all connections.</span><br><span class="line">PooledDataSource forcefully closed/removed all connections.</span><br><span class="line">Opening JDBC Connection</span><br><span class="line">Created connection 1238080693.</span><br><span class="line">Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@49cb9cb5]</span><br><span class="line"></span><br><span class="line">==&gt;  Preparing: select id,name,gender,email from Test_MyBatis where id = ? </span><br><span class="line">==&gt; Parameters: 1(Integer)</span><br><span class="line">&lt;==      Total: 1</span><br><span class="line">User [id=1, name=YUbuntu0109, gender=M, email=Gentleman_0109@outlook.com]</span><br><span class="line"></span><br><span class="line">Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@49cb9cb5]</span><br><span class="line">Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@49cb9cb5]</span><br><span class="line">Returned connection 1238080693 to pool.</span><br></pre></td></tr></table></figure></li>
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            titleTime = setTimeout(function() {
                document.title = OriginTitile;
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})();
</script>



</body>
</html>
